Heating system



Sept; 7,1948. I U; RAU' 2,448,988

HEATING SYSTEM Filed Dec. 15, 1945 INVENTOR y yj 4M1 Patented Sept. 7, 1948 UNITED STATES" PATEN GFFI:GE-:-

2;44s,9ss*

HEATING SYSTEM- i JiiIiusLa-Raus, WestbcrhfCiinn; Ap lication-December 1'3, 1945;SeriaI Nop63440- 3 Claims." (01. ear--20 1 Thisinventi'on relates to heating systems and apparatus therefor, and relates more particularly to a n'overheatin system for space heating and? for theheating of domestic-hot water'.

important "object of the invention is"topic vide means; ir'i conjunction-with a-'wlnf;er air-* conditioning furnace; for heating" dom'esti'c l hot water, bath in the wintertinfe as well as irl the summer;

sion' of a heating system wherein 'domesti'c' hot to 'provid a' dual heating system for space heat- 1 iri'g and for the heating of domestic hot "water, wherein n'o chan'ge "intheapparatus is necessary from 'win tefi operation; when both rooms and thedomestic waterarheate'd, to summer operation readjustments=betweensummer and winter operatioh 'maybe'mad'e; but these can be quickly andeasilyeffected'and theydo n'ot altertheprincipal operatin characteristics of the system;

Hot air heating systems have; in general,beeneffective only-for a single purpose; 1. e.,- space heating. Efforts'to p1ace-coils for domestic hot net, have failed for one or more of a' number of reasons; mostos which were related,- directlycr= Thuspa \va'tez coil placed in the'radiant heat zonebecame 1 indirectlyyto the 'problem' of control.

overheated in cold Weather when the rooms calledfor heat over considerableperiods of time.- Insome cases, if the system supplied sufiicient domesti'c hot water in' the winter; the space-heating efficiency was greatly impaired. Othera-rranga' ments gave too little hot waterirr the summer and'to-o 'mu-ch in the'winter. Also; cut-off means for space'heating' in the summer were oniylpanw tially 's'atisfactory:

An'irn'portaht feature of the systemof thepresen't 'invent-i'on resides in the fact that. the heat transfer coils for the domestic riot-Water:su-pply. are disposed within a separate by-pas duct disposed outside but adjacent to the fui nace lions-- i'n'gj theopposit'e-ends "of the duct being connected adjacent to the 'return: air duct from the-house anaithe air'supply duct to-the house, respectively.

The amount of heated air passing throughthis lay-pass duct and" available for domestic water heating; is automatically --re'gulated by. a damper which is c'cintrOiI-able by the same =prlme mover :20 when only the latter is heated. If desired, slight- 21 v as controls; operation or the dampers which cut out hot air supply to the house duringi'summer operation; Means are' prcvide'dginthe system :ior-l socontrolling both T ducts' as to always favor the airsuphly for-:house heating 'riur-in'g winter-oper ation, in order that" i there no: diminution in. house-heating efiici-ency; though providingan ad.- eqiiate supply of: domestic hot water at all times;

The apparatus of the-present invention is: ineexpensiveto construct; issimplein operation and A can either lie-built: into any standard hot air tunnace or ean-bereadily-installed:in a furnaceah ready inloperation- In'the'drawlngs:

Fig. 1 is a top plan view of the supplementai domestic hot water heatingapparatus ofthe present inventiom illustrated in connection with av. conventional hot: air furnace: havin ducts andaa blower;

Fig: 2'is a'sideelevation thereof;

Fist-'31s asection': takemon line 3-3'=of= Fig.2; v

Fig? killustrates a' circuit arrangement; v

In"the -drawii1g; I 1} designates a conventional hot air" furn'ace'having a return' duct M from the house-and aiheatediair supplyduct l2? B y 'pass" duct 1'3 '*may; be generally square Y in transverse" section" and is provided with curved terminal portions 1 (4'; one' of which :is connected with thefurnace housing-adjacent to-returm ducti land the'opposite one of which is connected a jacent 'tosupply' duct-1'2;

Domestic'Water 'heatin coils H are disposedwithirfduct l3' at any suitable point-and are provided w'lth terminals -l'8' 'for connection with the. domestic water system; Theparticuian form 01x contour of coils H is a matter of choice; it on'l'y b'eingztdesirable to soarrange the coils as-to Ob? taih a maxinium transfer of heat 'fromtthe .heat-- ed 'ai ry- Aregulating'namper Ia carriedorrshaft 29. is'pivot'ally-mountedwithin the duct and is of-l such proportions as to "subSta-ntiaHyf completely-- block offi the duct when fully closed,: although under normal operation this regulating dampeisisi never fully-closed; as will' be pointed*outmore in detail hereinafter.

55 fu-llifcl'osedl' Iii'noi'm'al cperation'of'thesystem' V such dampers are either fully opened or fully a pin 38 positioned in slot 34 in crank member 33 on motor shaft 32. Another, and somewhat longer link H is connected at one end thereof with pin 38 and at its opposite end is provided with a pin 42 pivotally mounted within an aperture adjacent the outer terminal of crank member2l', The provision of slot 35 in crank member 28 assures a more positive closure of the dampers air supply duct l2 whereas there is less need for such a tight closure of the damper in return duct l l.

A link 45 carries at one end thereof a pin 46 which passes through one of a plurality of openings 41 in a crank member 48 carried on regulating damper shaft 2a. At its other end link 45 is connected with crank member 21.

An operative circuit arrangement is shown in Fig. 4:. Power lines 58 pass through fuse box El and transformer 52 to damper control 53. 54 is the usual thermostat for regulating room temperature. A combination furnace control is indicated-at 55, and '55 designates an Aquastat positioned in the domestic hot water supply tank (not shown). Terminals 51 may be connected with the burner.

The circuit is so arranged as to cause both the thermostat and the Aquastat to operate the damper motor 3!. During the periods when the thermostat is not calling for heat the .main dampers 22 and 23 are closed. When the thermostat calls for heat the motor opens the main dampers and maintains them in open position until the thermostat is satisfied and at such time reverse action of the motor closes the main dampers.

The operation of the system may be substantially as follows: Following a period of inactivity, the room thermostat 54 will call for heat and this will cause the main dampersZZ and 23 to open fully while partially closing the by-pass chamber. The burner then commences operation and when the air temperature in the bonnet rises to a predetermined point, generally around 175 F., the furnacestat (not shown), controlling the operation of the blower makes contact and starts operation of the blower motor and accordingly delivers heat to the house. Inasmuch as the bypass damper is not fully closed, a small amount of the hot air passes through the by-pass duct l3 and accordingly heats coils H. The volume of air passing through the by-pass duct under such condition is suflficiently small as not to deprive the house of any considerable quantity of heat.

After the room thermostat is satisfied the main damper closes fully and the by-pass damper opens fully. The burner then stops and the blower motor continues to operate until the air temperature in the bonnet reaches a predetermined low point of approximately 150 F., at which point the furnacestat controlling the blower motor stops operation of such motor. In the event that the air temperaturebuilds up in the bonnet due to residual heat in the furnace, the blower will again commence operation and cause the heated air to pass over the hot water coils but not to the house since the main dampers are closed.

The Aquastat 56 which is desirably located in the hot water storage tank is influenced by the temperature of such water. When the Aquastat calls for heat the circuit arrangement is such as to cause the burner to commence operation while the main dampers remain in a closed position. At this time also, the by-pass chamber is still wide open. As soon as the temperature in the bonnet reaches the same predetermined high point (i. e., 175 F.) the furnacestat controlling the blower motor makes contact and the blower forces the hot air through the by-pass duct over the water heating coils. As soon as the Aquastat is satisfied the burner cuts off and the blower motor continues to operate until the temperature of the air in the bonnet is cooled to the predetermined point (i. e., F.) where the furnacestat stops operation of the motors.

In hot air heating systems the furnace is usually provided with an upper limit control so that if the air-temperature in the bonnet should rise too high such limit control automatically stops operation of the burner but permits the blower to operate until the air temperature has been reduced to a safe temperature.

In the event that both the thermostat and Aquastat call for heat at the same instant, the thermostat nevertheless operates the damper motor to open the main dampers and the house will thereupon become heated until the thermostat is satisfied. At this point, the main dampers again close and the Aquastat takes over control of the system until the water temperature in the storage tank has been raised to a desired point.

It will be appreciated from the foregoing that during summer operation the main dampers will remain fully closed at all times since the room temperature would, in all events, not drop sufficiently to influence the thermostat to start operation of the burner and open the main dampers. This arrangement prevents any heat from rising to the house. In other words, the burner and the blower operate only when the Aquastat calls for hot water.

While one form or embodiment of the invention has been shown and described herein for illustrative purposes, and the construction and arrangement incidental to a specific application thereof have been disclosed and discussed in detail, it is to be understood that the invention is limited neither to the mere details or relative arrangement of parts, nor to its specific embodiment shown herein, but that extensive deviations from the illustrated form or embodiment of the invention may be made without departing from the principles thereof.

What I claim is:

1. Ina hot air system for the heating of space and domestic hot water and including a furnace provided with a burner, air supply and air return chambers and ducts leading from such chambers for the space heating, the combination of dampersin each of said'ducts arranged to close the same, and a by-pass duct connecting such chamber s, a conduit for the heating of the domestic hot water within the by-pass duct, a damper arranged to close the by-pass duct, a damper motor arranged to completely close the air supply and return ducts and open the by-pass duct when in one position, and to open the former ducts and substantially close the latter duct when in another position, a thermostat responsive to the temperature in the space to be heated and an Aquastat responsive to the temperature of the domestic hot water, the thermostat being arranged to start burner operation and open the air supply and return duct dampers While substantially closing the by-pass damper when. the space calls for heat, the Aquastat being arranged to close the former dampers and open the latter when the space heating requirements have been satisfied and the domestic water calls for heat.

2. A hot air system for the heating of space and domestic hot water comprising a furnace provided with a burner having air supply and air return chambers, ducts leading from such chambers for the space heating, dampers in each of said ducts arranged to close the same, and a by-pass duct disposed exteriorly of the furnace connecting such chambers, coils for the heating of the domestic hot water within the bY-pass duct, a damper arranged to substantially close the by-pass duct, a damper motor arranged to completely close the air supply and return ducts and open the by-pass duct when in one position, and to open the former ducts and substantially close the latter duct when in another position, a thermostat responsive to the temperature in the space to be heated and an Aquastat responsive to the temperature of the domestic hot water, and a circuit controlling operation of the burner and the damper motor and including the thermostat and the Aquastat, the thermostat being arranged to start burner operation and open the air supply and return duct dampers while closing the by-pass damper, the Aquastat being arranged to close the former dampers and open the latter when the space heating requirements have been satisfied.

3. A hot air system for the heating of space and domestic hot water, comprising a furnace provided with a burner, and air supply and air return chambers, ducts leading from such chambers for the space heating, dampers in each of said ducts arranged to close the same, and a bypass duct connectin such chambers, coils for the heating of the domestic hot water within the by-pass duct, a damper arranged to close the by-pass duct, damper closing means arranged to completely close the air supply and return ducts and open the by-pass duct when in one position, and to open the former ducts and substantially close the latter duct when in another position, a thermostat responsive to the temperature in the space to be heated and an Aquastat responsive to the temperature of the domestic hot water, and a circuit controlling operation of the burner and the damper closing means and including the thermostat and the Aquastat, the thermostat being arranged to start burner operation and open the air supply and return duct dampers while closing the by-pass damper, the Aquastat being arranged to close the former dampers and open the latter when the space heating requirements have been satisfied and the domestic water calls for heat.

JULIUS LA RAUS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,144,032 Geissinger June 22, 1915 2,266,217 Kingsland Dec. 16, 1941 2,314,086 Giffords Mar. 16, 1943 2,331,907 Harrington Oct. 19, 1943 

